Long Polling

Long Polling is done by calling getUpdates actively.

With our library, this can be done in one of three ways:

By setting bot.OnUpdate (and/or bot.OnMessage)

Setting those events will automatically start a background polling system which will call your events accordingly:

• OnMessage for updates about messages (new or edited Message, Channel Post or Business Messages)
• OnUpdate for all other type of updates (callback, inline-mode, chat members, polls, etc..)

Note

• If you don’t set OnMessage, the OnUpdate event will be triggered for all updates, including messages.
• If you want to ignore past/pending bot updates when restarting your bot, call await bot.DropPendingUpdatesAsync() before setting those events.

By using the StartReceiving method (or ReceiveAsync)

Those methods start a polling system which will call your method on incoming updates.

As arguments, you can pass either lambdas, methods or a class derived from IUpdateHandler that implements the handling of Update and Error.

By calling GetUpdates manually in a loop

You can specify a timeout so that the call blocks for up to X seconds, waiting for an incoming update

Here is an example implementation:

int? offset = null;
while (!cts.IsCancellationRequested)
{
    var updates = await bot.GetUpdates(offset, timeout: 2);
    foreach (var update in updates)
    {
        offset = update.Id + 1;
        try
        {
            // put your code to handle one Update here.
        }
        catch (Exception ex)
        {
            // log exception and continue
        }
        if (cts.IsCancellationRequested) break;
    }
}